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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'dd910f14b4c8c4db3deb54aba1e5b01d92b5f1a3e3a4975f7cf7f15e618b7d37' 
  AND token = 'C/vtGuZCsR1EI0v+ZXPT+2HQKO0/zbyrm3nZvttkSWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00852

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}